vp8: Updates for adaptive denoiser mode.

Add qp/bitrate condition, update some settings.

Change-Id: I1af0f102823a886393be063ad9d17d7564753cc7

vp8/encoder/denoising.c

@@ -412,12 +412,27 @@ int vp8_denoiser_allocate(VP8_DENOISER *denoiser, int width, int height,
     vp8_denoiser_set_parameters(denoiser, mode);
     denoiser->nmse_source_diff = 0;
     denoiser->nmse_source_diff_count = 0;
+    denoiser->qp_avg = 0;
+    // QP threshold below which we can go up to aggressive mode.
+    denoiser->qp_threshold_up = 80;
+    // QP threshold above which we can go back down to normal mode.
+    // For now keep this second threshold high, so not used currently.
+    denoiser->qp_threshold_down = 128;
+    // Bitrate thresholds and noise metric (nmse) thresholds for switching to
+    // aggressive mode.
     // TODO(marpan): Adjust thresholds, including effect on resolution.
+    denoiser->bitrate_threshold = 200000;  // (bits/sec).
     denoiser->threshold_aggressive_mode = 35;
-    if (width * height > 640 * 480)
+    if (width * height > 640 * 480) {
+      denoiser->bitrate_threshold = 500000;
+      denoiser->threshold_aggressive_mode = 100;
+    } else if (width * height > 960 * 540) {
+      denoiser->bitrate_threshold = 800000;
       denoiser->threshold_aggressive_mode = 150;
-    else if (width * height > 1280 * 720)
+    } else if (width * height > 1280 * 720) {
+      denoiser->bitrate_threshold = 2000000;
       denoiser->threshold_aggressive_mode = 1400;
+    }
     return 0;
 }
 

vp8/encoder/denoising.h

@@ -19,7 +19,7 @@ extern "C" {
 #endif
 
 #define SUM_DIFF_THRESHOLD (16 * 16 * 2)
-#define SUM_DIFF_THRESHOLD_HIGH (16 * 16 * 3)
+#define SUM_DIFF_THRESHOLD_HIGH (600)
 #define MOTION_MAGNITUDE_THRESHOLD (8*3)
 
 #define SUM_DIFF_THRESHOLD_UV (96)   // (8 * 8 * 1.5)
@@ -81,6 +81,10 @@ typedef struct vp8_denoiser
     int threshold_aggressive_mode;
     int nmse_source_diff;
     int nmse_source_diff_count;
+    int qp_avg;
+    int qp_threshold_up;
+    int qp_threshold_down;
+    int bitrate_threshold;
     denoise_params denoise_pars;
 } VP8_DENOISER;
 

vp8/encoder/onyx_if.c

@@ -3370,33 +3370,43 @@ static void process_denoiser_mode_change(VP8_COMP *cpi) {
   if (total > 0 &&
       (num_blocks > (tot_num_blocks >> 4))) {
     // Update the recursive mean square source_diff.
-    if (cpi->denoiser.nmse_source_diff_count == 0)
+    if (cpi->denoiser.nmse_source_diff_count == 0) {
       // First sample in new interval.
       cpi->denoiser.nmse_source_diff = total;
-    else
+      cpi->denoiser.qp_avg = cm->base_qindex;
+    } else {
       // For subsequent samples, use average with weight ~1/4 for new sample.
       cpi->denoiser.nmse_source_diff = (int)((total >> 2) +
           3 * (cpi->denoiser.nmse_source_diff >> 2));
+      cpi->denoiser.qp_avg = (int)((cm->base_qindex >> 2) +
+          3 * (cpi->denoiser.qp_avg >> 2));
+    }
     cpi->denoiser.nmse_source_diff_count++;
   }
   // Check for changing the denoiser mode, when we have obtained #samples =
-  // num_mode_change.
+  // num_mode_change. Condition the change also on the bitrate and QP.
   if (cpi->denoiser.nmse_source_diff_count == num_mode_change) {
     // Check for going up: from normal to aggressive mode.
     if ((cpi->denoiser.denoiser_mode == kDenoiserOnYUV) &&
         (cpi->denoiser.nmse_source_diff >
-        cpi->denoiser.threshold_aggressive_mode)) {
+        cpi->denoiser.threshold_aggressive_mode) &&
+        (cpi->denoiser.qp_avg < cpi->denoiser.qp_threshold_up &&
+         cpi->target_bandwidth > cpi->denoiser.bitrate_threshold)) {
       vp8_denoiser_set_parameters(&cpi->denoiser, kDenoiserOnYUVAggressive);
     } else {
       // Check for going down: from aggressive to normal mode.
-      if ((cpi->denoiser.denoiser_mode == kDenoiserOnYUVAggressive) &&
+      if (((cpi->denoiser.denoiser_mode == kDenoiserOnYUVAggressive) &&
           (cpi->denoiser.nmse_source_diff <
-          cpi->denoiser.threshold_aggressive_mode)) {
+          cpi->denoiser.threshold_aggressive_mode)) ||
+          ((cpi->denoiser.denoiser_mode == kDenoiserOnYUVAggressive) &&
+          (cpi->denoiser.qp_avg > cpi->denoiser.qp_threshold_down ||
+           cpi->target_bandwidth < cpi->denoiser.bitrate_threshold))) {
         vp8_denoiser_set_parameters(&cpi->denoiser, kDenoiserOnYUV);
       }
     }
     // Reset metric and counter for next interval.
     cpi->denoiser.nmse_source_diff = 0;
+    cpi->denoiser.qp_avg = 0;
     cpi->denoiser.nmse_source_diff_count = 0;
   }
 }